0=25x^2-3x-13

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Solution for 0=25x^2-3x-13 equation:


Simplifying
0 = 25x2 + -3x + -13

Reorder the terms:
0 = -13 + -3x + 25x2

Solving
0 = -13 + -3x + 25x2

Solving for variable 'x'.

Combine like terms: 0 + 13 = 13
13 + 3x + -25x2 = -13 + -3x + 25x2 + 13 + 3x + -25x2

Reorder the terms:
13 + 3x + -25x2 = -13 + 13 + -3x + 3x + 25x2 + -25x2

Combine like terms: -13 + 13 = 0
13 + 3x + -25x2 = 0 + -3x + 3x + 25x2 + -25x2
13 + 3x + -25x2 = -3x + 3x + 25x2 + -25x2

Combine like terms: -3x + 3x = 0
13 + 3x + -25x2 = 0 + 25x2 + -25x2
13 + 3x + -25x2 = 25x2 + -25x2

Combine like terms: 25x2 + -25x2 = 0
13 + 3x + -25x2 = 0

Begin completing the square.  Divide all terms by
-25 the coefficient of the squared term: 

Divide each side by '-25'.
-0.52 + -0.12x + x2 = 0

Move the constant term to the right:

Add '0.52' to each side of the equation.
-0.52 + -0.12x + 0.52 + x2 = 0 + 0.52

Reorder the terms:
-0.52 + 0.52 + -0.12x + x2 = 0 + 0.52

Combine like terms: -0.52 + 0.52 = 0.00
0.00 + -0.12x + x2 = 0 + 0.52
-0.12x + x2 = 0 + 0.52

Combine like terms: 0 + 0.52 = 0.52
-0.12x + x2 = 0.52

The x term is -0.12x.  Take half its coefficient (-0.06).
Square it (0.0036) and add it to both sides.

Add '0.0036' to each side of the equation.
-0.12x + 0.0036 + x2 = 0.52 + 0.0036

Reorder the terms:
0.0036 + -0.12x + x2 = 0.52 + 0.0036

Combine like terms: 0.52 + 0.0036 = 0.5236
0.0036 + -0.12x + x2 = 0.5236

Factor a perfect square on the left side:
(x + -0.06)(x + -0.06) = 0.5236

Calculate the square root of the right side: 0.723602101

Break this problem into two subproblems by setting 
(x + -0.06) equal to 0.723602101 and -0.723602101.

Subproblem 1

x + -0.06 = 0.723602101 Simplifying x + -0.06 = 0.723602101 Reorder the terms: -0.06 + x = 0.723602101 Solving -0.06 + x = 0.723602101 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.06' to each side of the equation. -0.06 + 0.06 + x = 0.723602101 + 0.06 Combine like terms: -0.06 + 0.06 = 0.00 0.00 + x = 0.723602101 + 0.06 x = 0.723602101 + 0.06 Combine like terms: 0.723602101 + 0.06 = 0.783602101 x = 0.783602101 Simplifying x = 0.783602101

Subproblem 2

x + -0.06 = -0.723602101 Simplifying x + -0.06 = -0.723602101 Reorder the terms: -0.06 + x = -0.723602101 Solving -0.06 + x = -0.723602101 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.06' to each side of the equation. -0.06 + 0.06 + x = -0.723602101 + 0.06 Combine like terms: -0.06 + 0.06 = 0.00 0.00 + x = -0.723602101 + 0.06 x = -0.723602101 + 0.06 Combine like terms: -0.723602101 + 0.06 = -0.663602101 x = -0.663602101 Simplifying x = -0.663602101

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.783602101, -0.663602101}

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